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XHTML Modules as XML 1.0 DTDs

Murray Altheim has done a good job in formalizing the XHTML modules as DTDs.

The approach makes heavy use of parameter entities, using the following suffices:

.mod

entities identifying DTD modules (files)

.module

entities used to control the inclusion of DTD modules

.content

entities defining element content models

.class

used for elements from the same class

.mix

used for elements from different classes

.attrib

used for one or more attribute specifications

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